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1993 Buick roadmaster, blower motor will not change from floor to vent, or defrost. Its stuck on vent, any ideas?

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Yes , there are vacuum controlled doors behind the dash in the heater / AC assembly that control where the air is directed to . They are controlled electrically by the solenoid module ! You could have a bad solenoid , a leaking vacuum diaphragm or hose , the control panel could be bad ! You would have to take part of the dash apart to get at the components or all of the dash ! This is not a job for the faint at heart ! To me , no big deal . I have done several . Pull the lower right side insulator panel an listen for a vacuum leak while operating the system ! Pull the control head an do some electrical testing at the wiring connectors on the back ! You need a wiring diagram to know what wires are for what ! You can pull the glove box out an see the solenoid module ! It will have vacuum hoses an wiring going to it ! One more thing I have seen is objects down inside , pencils etc... from the defrost vent . blocking the door from moving ! You would need to pull the whole heater assembly out an take it apart to fix this !

Posted on Apr 30, 2015

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Air control motor needs replaced middle of dash under dash not a fun job for anyone .

Posted on Apr 30, 2015

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Posted on Jan 02, 2017

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SOURCE: blower selector switch not switching

Hi,
more than likely you will need a new climate control switch unit
Scrap yard or eBay for less than $30 most times.
This is the cheapest, easiest and fastest way to check or repair these.
Art

Posted on Aug 04, 2008

motor1258
  • 6674 Answers

SOURCE: blower will not switch to defrost,floor,just vent,no heater

You did check for vacuum lines off, or wiring harnesses not plugged in all the way, or at all didn't you? Did you pay someone to do this, or do it yourself, because if you paid someone, have them look at all the connections .

Posted on Nov 23, 2008

  • 37 Answers

SOURCE: Blower motor vent selection switch not working

the hvac selector switch in the dash may be the problem.You need to remove the switch and look at the connector on the back of switch,see if there are any burnt wires at the connector or switch.It's all electronic and the switches have been known to burn out on this and other model.

Posted on May 26, 2009

  • 1 Answer

SOURCE: AIR FLOW STUCK IN DEFORST VENT WILL NOT SWITCH TO FLOOR OR AC VEN

I found a broken vacuum hose on top of the intake which runs the controls

Posted on May 30, 2009

  • 279 Answers

SOURCE: where is the blower motor located on 92 buick

Passenger side of dash, directly underneath the glove compartment. Remove the plastic cover under the dash to access the motor.

Posted on Jan 30, 2010

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